我正在尝试实现一些允许我计算用户使用该应用程序的时间的东西，但它似乎很难或至少编码复杂。我尝试了几次尝试和逻辑，但都失败了。
我不确定这是否是写的，但我创建了两个变量，如下所示
static Date startTime = new Date();
The startTime variable goes in the main activity and it notes the time user launched the app.
static Date endTime = new Date();
The endTime goes in the onDestroy method and takes the time when the user closes the app.
If this approach is write, I understand I would need to find out the different between the two times but I am not sure how to attempt something like this. Could someone please help, what I want to be able to do is get a final value and pass it to the code below and send it over to Google Analyst for Android;
/*
* Called after a list of high scores finishes loading.
*
* @param loadTime The time it takes, in milliseconds, to load a resource.
*/
public void onLoad(long loadTime) { // I need to put my value instead of loadTime, but I cannot figure out how to find the difference between two times.
// May return null if EasyTracker has not been initialized with a property
// ID.
Tracker easyTracker = EasyTracker.getInstance(this);
easyTracker.send(MapBuilder
.createTiming("resources", // Timing category (required)
loadTime, // Timing interval in milliseconds (required)
"high scores", // Timing name
null) // Timing label
.build()
);
}
谢谢，我真的很感激任何帮助。